JP3101065B2 - Fungicide for rice seed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to diseases caused by filamentous fungi such as rice idiot disease, rice blast disease, rice sesame leaf blight and rice seedling blight which occur during the seedling raising period, and rice seed blight bacteria. The present invention relates to a fungicide for agricultural and horticultural use for controlling rice seedling rot caused by bacteria such as rice seedling wilt and rice brown streak.

[0002]

BACKGROUND OF THE INVENTION Benomyl, TMTD, prochloraz, and pefurazoate, one of the active ingredients of the present invention, are rice idiot, rice blast, rice sesame leaf blight, and rice seedling caused by filamentous fungi that occur during the seedling raising stage. Although it is known to be effective against damping-off and the like, it is impossible to control rice seedling rot caused by bacteria that occur during the rice seedling stage. In addition, hydroxyisoxazole and metalaxyl are known to be effective against rice seedling damping-off caused by filamentous fungi that occur during the seedling raising stage. It is impossible to control rice seedling rot. Also, it is known that potassium bicarbonate, sodium bicarbonate, potassium carbonate, sodium carbonate, calcium hydroxide, and the like, which are the other active ingredients, are effective as agents for controlling plant diseases caused by filamentous fungi (Japanese Unexamined Patent Application, First Publication No. H11-163873). Showa 51-6393
No. 2). The present invention makes use of the property that filamentous fungi that are parasitic on plants generally grow well on the acidic side and growth is inhibited on the basic side, and are sufficiently resistant to diseases caused by phytopathogenic bacteria. Effects cannot be obtained. In addition, by combining potassium hydroxide, sodium hydroxide, potassium bicarbonate, sodium bicarbonate, potassium carbonate, sodium carbonate, etc. with a bactericidal metal salt compound which causes chemical damage to crops, the effect is increased, the effect is maintained and the chemical damage is reduced. Is known to be reduced (Japanese Patent Laid-Open No. 55-271).
No. 64 and JP-A-60-123410). However, the composition is synergistic and slow because the basicity of the alkalis and salts provides direct bacteriostatic power and suppresses rapid release of bactericidal metal ions. In addition, they mainly exert a function as a metal ion regulator, and the disease control effect by alkalis and salts alone is not sufficient. In addition, it has been reported that calcium carbonate can prevent mosaic disease (viral) of vegetables by spraying, but there is no description about bacterial disease (Japanese Patent Application Laid-Open No. 48-13522). Copper compounds such as cupric hydroxide are generally used as agents for controlling diseases caused by bacterial growth in various crops. However, the effect as a fungicide for seeds is not sufficient.

[0003]

In rice cultivation, with the introduction of mechanical transplantation, most of the seedling raising methods have been changed to box raising seedling methods. In the present seedling raising method, rice seedlings are placed under a high temperature and high humidity condition of about 32 ° C. For this reason, pathogens inhabiting the soil or on the surface of paddy will be given environmental conditions suitable for propagation, and rice seedlings will be established by genus Picium, Rhizopus, Fusarium, Trichoderma, Pseudomonas, etc. Blight easily occurs and rice seedlings tend to be soft. In particular, rice blight seedlings (Giberella)
Pseudomonas plantari, Pseudomonas planta, Pseudomonas glumae, Pseudomonas glumae
i) or rice brown streak (Pseudomonas avena; Ps
Eudomonas avenae) has caused a gradual increase in rice seedling rot in recent years, and has become a major problem for raising rice seedlings. However, none of the seed disinfectants currently in practical use are simultaneously effective against diseases caused by fungi and bacteria. In addition, the number of chemicals for controlling rice seedling rot caused by bacteria is small, and the method of use is limited, and the effect is not always perfect. For this reason, development of an inexpensive and low-impact control agent is desired.

[0004]

Means for Solving the Problems The present inventor has conducted intensive studies in order to solve the above problems, and as a result, found that benomyl, TMT
A composition comprising at least one compound selected from D, prochloraz, and perfurazoate and a carbonate selected from calcium carbonate, basic magnesium carbonate, ammonium carbonate, ammonium bicarbonate, and potassium hydrogencarbonate as active ingredients in rice seed or seedling culture Diseases caused by filamentous fungi such as rice idiot disease, rice blast disease, rice sesame leaf blight disease and rice seedling blight disease, and rice paddy bacterial wilt, rice seedling wilt and rice brown streak It has also been found that rice rot caused by bacteria such as germs and fungi has an extremely excellent control effect. Also, hydroxy isoxazole or
By treating a composition containing metalaxyl and the above-mentioned carbonate as active ingredients on rice seeds or seedling cultivation soil, diseases caused by filamentous fungus of rice seedling blight and bacterial wilt of rice germ, bacterial wilt of rice seedling And rice rot caused by bacteria such as rice brown streak and the like. Furthermore, the present inventors have found that by mixing a copper compound with the above composition, a precise and stable control effect against diseases caused by bacteria can be exerted, and the present invention has been completed.

[0005] That is, the present invention relates to a compound comprising at least one compound selected from benomyl, TMTD, prochloraz, perfurazoate, hydroxyisoxazole and metalaxyl, and calcium carbonate, basic magnesium carbonate, ammonium carbonate, ammonium bicarbonate and potassium hydrogen carbonate. A fungicide for rice seeds containing a selected carbonate as an active ingredient, and a fungicide for rice seeds obtained by adding a copper compound to these active ingredients. The structure of the compound used in the present invention is as follows. Benomyl:

[0006]

Embedded image Thiophanate methyl:

[0007]

Embedded image TMTD:

[0008]

Embedded image Prochloraz

[0009]

Embedded image Perfurazoate

[0010]

Embedded image Triflumizole

[0011]

Embedded image Hydroxyisoxazole

[0012]

Embedded image Metalaxyl

[0013]

Embedded image

[0014] The fungicide for seeds of the present invention is usually used by a method such as seed immersion, seed dressing, and mulling. That is,
Seed paddy is immersed in an aqueous solution prepared by diluting the preparation to 100 ppm to 10000 ppm with water, or a powdered drug is added to a 0.1% aqueous solution.
% To 2.0% can be used after dressing the seeds. Also, 3 g to 60 g per rice seedling box is mixed with the whole cultivation before seeding, and 3 g to 60 g per rice seedling box is mixed with soil cultivation for seeding, and after sowing, soil is covered, or 3 g to 60 g per rice seedling box.
Any method can be used, such as mixing g with floor soil and covering after sowing (the numerical values represent the total amount of active ingredients).

The drug of the present invention may use the active ingredient as it is, but is used after being formulated into a generally used agricultural chemical formulation. That is, a carrier, a surfactant, a dispersant, an auxiliary agent, and the like are blended with the active ingredient, and powders, wettable powders, fine granules, granules,
It is formulated into an aqueous suspension (sol). As a carrier,
For example, carriers such as clay, talc, bentonite, kaolin, diatomaceous earth, white carbon, silica sand, ammonium sulfate, urea, vermiculite and the like can be mentioned. Surfactants and dispersants include, for example, diarylalkyldisulfonic acid,
Examples thereof include alcohol sulfates, alkyl aryl sulfonates, lignin sulfonates, polyoxyethylene alkyl aryl ethers, and polyoxyethylene sorbitan monoalkylates. Examples of the auxiliary include carboxymethyl cellulose, polyethylene glycol, gum arabic and the like.

The compounding ratio of the active ingredient in each preparation is appropriately selected as necessary. The active ingredient is 1 to 50% (by weight) for powders, fine granules, granules and aqueous suspensions, Is suitably in the range of 10 to 95% (weight). Also,
Benomyl, TMTD, prochloraz, and pefurazoate are suitably blended at 1 to 40% (by weight) in the formulation, and carbonate is suitably blended at 10 to 80% (by weight) in the formulation.
The mixing ratio of TMTD, prochloraz, perfurazoate and carbonate is appropriately selected as necessary, but the weight ratio is 1: 0.1 to 1:50, preferably 1: 0.5 to 1:
It is 10. When adding a copper compound, add 1 to 1
0% by weight is suitable. It is appropriate that hydroxyisoxazole and metalaxyl are blended in the preparation in an amount of 0.5 to 40% (weight), and carbonate is in the formulation in an amount of 10 to 80% (weight). The mixing ratio is appropriately selected as needed, but is preferably from 1: 0.1 to 1:50, preferably from 1: 0.5 to 1: 0.5 by weight.
1:10. If a copper compound is added, 1
To 10% by weight. Examples of the copper compound include hydroxides, salts, double salts and chelate compounds of divalent copper ions, such as copper sulfate, cupric hydroxide, basic copper sulfate, and the like. Examples thereof include copper hydroxyquinoline and cupric chloride.

The application rate of the present invention varies depending on the kind of the compound used, the tendency of occurrence, the degree of damage, environmental conditions, dosage form, application method and the like. For example, in the case of seed soaking treatment, the concentration of 500 ppm to 5000 ppm, in the case of seed dressing treatment, 0.1% to 2.0% (dry seed weight ratio), the amount of dressing,
In the case of rice cultivation soil mixing, 3g to 6 per seedling box
An amount of 0 g is appropriate (each numerical value represents the total amount of the active ingredient).

[0018]

EXAMPLES Next, the formulation, use and effect of the fungicide for agricultural and horticultural use of the present invention will be specifically described with reference to examples, but the mixing ratio of the active ingredient and other components does not impair the gist of the present invention. It can be arbitrarily changed within the range. Further,% in the following examples indicates weight percentage.

Formulation Example 1 (Powder) 2% of TMTD, 50% of calcium carbonate, 5% of diatomaceous earth and 43% of clay were uniformly mixed and pulverized to obtain a powder.

Formulation Example 2 (Powder) Prochloraz 2%, Ammonium carbonate 20%, Diatomaceous earth 5
% And 73% of clay were uniformly mixed and pulverized to obtain a powder.

Formulation Example 3 (Powder) Hydroxyisoxazole 4%, Metalaxyl 0.5
%, Ammonium bicarbonate 50%, diatomaceous earth 5% and clay 40.5% were uniformly mixed and pulverized to obtain a powder.

Formulation Example 4 (Wettable powder) Pefurazoate 20%, calcium carbonate 40%, diatom 3
5%, sodium dinaphthylmethane disulfonate 2% and sodium lignin sulfonate 3% were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 5 (Wettable powder) 15% of prochloraz, 15% of TMTD, 25% of basic magnesium carbonate, 40% of diatomaceous earth, 2% of sodium dinaphthylmethanedisulfonate and 3% of sodium ligninsulfonate are uniformly mixed and pulverized. To obtain a wettable powder.

Formulation Example 6 (Wettable powder) 30% hydroxyisoxazole, 4% metalaxyl,
50% calcium carbonate, 11% diatomaceous earth, 2% sodium dinaphthylmethanedisulfonate and 3% sodium ligninsulfonate were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 7 (Wettable powder) Benomyl 20%, TMTD 20%, basic magnesium carbonate 40%, diatomaceous earth 15%, sodium dinaphthylmethanedisulfonate 2% and sodium ligninsulfonate 3% are uniformly mixed and ground. To obtain a wettable powder.

Formulation Example 8 (Wettable powder) Pefurazoate 30%, potassium bicarbonate 50%, diatomaceous earth 15%, sodium dinaphthylmethane disulfonate 2
% And sodium ligninsulfonate were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 9 (Wettable powder) 15% benomyl, 15% TMTD, 25% basic magnesium carbonate, 5% cupric hydroxide, 35% diatomaceous earth, 2% sodium dinaphthylmethanedisulfonate and sodium ligninsulfonate 3% was uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 10 (Wettable powder) Triflumizole 25%, TMTD 15%, potassium hydrogen carbonate 25%, cupric hydroxide 5%, diatomaceous earth 25%, sodium dinaphthylmethane disulfonate 2% and lignin sulfonic acid 3% of sodium was uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 11 (Wettable powder) Prochloraz 20%, calcium carbonate 60%, cupric hydroxide 10%, diatomaceous earth 5%, sodium dinaphthylmethanedisulfonate 2% and sodium ligninsulfonate 3
% Was uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 12 (Sol) 15% of pefurazoate, 15% of calcium carbonate, 4% of polyoxyethylene alkylaryl ether sulfate, 10% of ethylene glycol and 56% of water were wet-pulverized to obtain a sol.

Formulation Example 13 (sol) 15% pefurazoate, 15 basic magnesium carbonate
%, Cupric hydroxide 2.5%, polyoxyethylene alkyl aryl ether sulfate 4%, ethylene glycol 1
0% and 53.5% of water were wet-pulverized to obtain a sol.

Formulation Example 14 (granules) Pefurazoate 4%, basic magnesium carbonate 40%,
2% sodium salt of lauryl alcohol sulfate
5% sodium ligninsulfonate, 2% carboxymethylcellulose and 47% clay are uniformly mixed and pulverized. After adding 20% of water to the mixture and kneading the mixture and processing the mixture into granules of 14 to 32 mesh using an extrusion granulator,
Dried to granules.

Formulation Example 15 (Wettable powder) benomyl 10%, basic magnesium carbonate 30%, diatomaceous earth 55%, sodium dinaphthylmethanedisulfonate 2
% And sodium ligninsulfonate were uniformly mixed and pulverized to obtain a wettable powder.

Formulation Example 16 (Wettable powder) Triflumizole 25%, calcium carbonate 25%, diatomaceous earth 45%, sodium dinaphthylmethanedisulfonate 2
% And sodium ligninsulfonate were uniformly mixed and pulverized to obtain a wettable powder.

Test Example 1 Test for Controlling Rice Rot Caused by Bacterial Blight of Rice by Seed Soaking Treatment An aqueous solution having a predetermined active ingredient concentration was prepared using the agents prepared according to Preparation Examples 4 and 7. Rice seeds (variety: Koganebare), which had been preliminarily immersed and inoculated with the rice seedling bacterial bacterium, were immersed in this solution for 24 hours and immediately air-dried. After soaking the treated seeds in water (3 days), the seeds were treated at 30 ° C. for 24 hours.
Sprout for hours, leave in a pigeon chest state, 120 seedlings per box
g was seeded uniformly. Ten days after sowing, 100 seedlings per seedling box were arbitrarily selected, the disease status was investigated, and the disease severity and control value were calculated by the following criteria and formulas (Formulas 1 and 2). Table 1 shows the results.

[0036]

(Equation 1)

N0 ..... number of seedlings that are not diseased N1 ..... number of seedlings that are diseased only in leaf sheath and incomplete leaves N2 ..... Number of seedlings N3 ..... Number of seedlings that have reached the second leaf of the true leaf N4 ..... Number of seedlings that have rotted and died

[0038]

(Equation 2)

[0039]

[Table 1]

Test Example 2 Test for Controlling Rice Rot Caused by Bacterial Bacterial Blight of Rice by Seed Soaking Treatment The same treatment as in Test Example 1 was carried out using the agents prepared according to Formulation Examples 11, 12, 13 and 15. A survey was conducted. Table 2 shows the results.

[0041]

[Table 2]

Test Example 3 Control Test of Rice Rot Caused by Bacterial Blight of Rice by Seed Dressing Treatment Rice seeds (variety: Koganebare) immersed and inoculated with Bacterial Blight of Rice were formulated into Formulation Examples 7 and 8. A predetermined amount of the prepared drug was wet-coated. After the chemical-treated seeds were immersed in water (3 days), the seeds were germinated at 30 ° C. for 24 hours, and the seedlings were placed in a pigeon breast state and seeded uniformly in an amount of 120 g per nursery box. 10 days after sowing, 100 seedlings per seedling box are arbitrarily selected,
Based on the criteria and formula described in Test Example 1, the onset of disease was investigated, and the onset of disease and the control value were calculated. Table 3 shows the results.

[0043]

[Table 3]

Test Example 4 Test for Control of Rice Rot Caused by Rice Blight Bacterial Bacteria by Incorporation of Rice Seedling Bacterial Bacterium into Rice Seed (variety: Koganebare) immersed and inoculated with rice blight blight The seedlings were allowed to germinate at 30 ° C. for 24 hours. A predetermined amount of the drug prepared according to Formulation Examples 1 and 3 was mixed with the floor soil (Pearl Mat; manufactured by Katakura Tikkalin) of one nursery box. 10 days after sowing, 10
0 seedlings are arbitrarily selected, and according to the criteria and formula described in Test Example 1,
Disease incidence was investigated and the disease severity and control value were calculated. Table 4 shows the results. In addition to the active ingredient alone as a comparative drug,
Kasugamycin 2% granules (kasmin granules) were used at the usual dosage.

[0045]

[Table 4]

Test Example 5 Test for controlling rice rot caused by bacterial wilt of rice by seed immersion treatment Using an agent prepared according to Preparation Examples 5, 9, 10 and 16, an aqueous solution having a predetermined active ingredient concentration was prepared. Produced. Rice seeds (cultivar: Sasanishiki) obtained by inoculating rice bacterial wilt disease in the field at the heading stage in this chemical solution were immersed for 24 hours and immediately air-dried. After the chemical-treated seeds were immersed in water (3 days), the seeds were germinated at 30 ° C. for 24 hours, and the seedlings were placed in a pigeon breast state and seeded uniformly in an amount of 120 g per nursery box. Sowing 15
One day later, 100 seedlings per seedling box were arbitrarily selected, the disease status was investigated, and the disease severity and control value were calculated using the criteria of Test Example 1 and the formulas (Equations 1 and 2). Table 5 shows the results.

[0047]

[Table 5]

[0048]

EFFECTS OF THE INVENTION As is clear from the above test results, the germicidal agent for disinfecting rice seeds of the present invention is a bacterium such as a bacterial germ of rice seedling, a germ of bacterial germination of rice seedling, and a germ of rice streak. For seedling rot caused by fungus, and rice idiot disease, rice blast, rice sesame leaf blight and rice seedling blight caused by filamentous fungus, seed soaking treatment, admixing treatment to seedling box culture soil, or seed dressing It has a high control effect by the treatment.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI A01N 47/38 A01N 47/38 BC 59/06 59/06 Z (58) Investigated field (Int.Cl. ⁷ , DB name) ) A01N 59/00 A01N 37/46 A01N 43/80 101 A01N 47/26 A01N 47/38 A01N 59/06

Claims (2)

(57) [Claims] 1. One or more compounds selected from benomyl, TMTD, prochloraz, perfurazoate, hydroxyisoxazole, metalaxyl and carbonic acid selected from calcium carbonate, basic magnesium carbonate, ammonium carbonate, ammonium bicarbonate and potassium hydrogen carbonate. A fungicide for rice seeds, comprising a salt as an active ingredient. 2. A fungicide for rice seeds comprising the active ingredient according to claim 1 and a copper compound selected from hydroxides, salts, double salts and chelate compounds of divalent copper ions.